Remove trailing whitespace.
diff --git a/Doc/tutorial/inputoutput.rst b/Doc/tutorial/inputoutput.rst
index ef783ae..34d984a 100644
--- a/Doc/tutorial/inputoutput.rst
+++ b/Doc/tutorial/inputoutput.rst
@@ -87,7 +87,7 @@
 
    >>> for x in range(1,11):
    ...     print '{0:2d} {1:3d} {2:4d}'.format(x, x*x, x*x*x)
-   ... 
+   ...
     1   1    1
     2   4    8
     3   9   27
@@ -162,7 +162,7 @@
    >>> table = {'Sjoerd': 4127, 'Jack': 4098, 'Dcab': 7678}
    >>> for name, phone in table.items():
    ...     print '{0:10} ==> {1:10d}'.format(name, phone)
-   ... 
+   ...
    Jack       ==>       4098
    Dcab       ==>       7678
    Sjoerd     ==>       4127
@@ -330,7 +330,7 @@
    >>> f = open('/tmp/workfile', 'r+')
    >>> f.write('0123456789abcdef')
    >>> f.seek(5)     # Go to the 6th byte in the file
-   >>> f.read(1)        
+   >>> f.read(1)
    '5'
    >>> f.seek(-3, 2) # Go to the 3rd byte before the end
    >>> f.read(1)